PHIL 1030 Lecture 1: Phil 1030

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Philosophy 1030
Jan. 12 2016
Important terms to know
Argumentstatement or set of statements (premises) intended to provide support or evidence for
further statements (conclusions)
Valid argumentif premises is true, conclusion must also be true
Good argument argument that is valid and has true premises
Example 1
Premise 1: Frank only dances when he is drunk.
Premise 2: Frank is dancing.
Conclusion: Frank is drunk.
^Valid
Example 2
Premise 1: Frank only dances when he is drunk.
Premise 2: Frank is not dancing.
Conclusion: Frank is not drunk.
^Invalid because frank could be drunk without dancing, but he will only dance if he is drunk.
Example 3
P1: All cats wear top hats.
P2: All things that wear top hats live on the moon.
C: Therefore all cats live on the moon.
Valid*
P1 If all A’s are B’s
P2All B’s are C’s
CThen all A’s are C’s
Example 5
P1: If Sally has a fever, she is sick.
P2: Sally isn’t sick.
C: Sally doesn’t have a fever
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